Omega Products DRG-SC-PT Installation Manual

DRG-SC-PT
Potentiometer Input, Field Configurable Signal Conditioner

Instruction Sheet M2393/0796

DESCRIPTION

The DRG-SC-PT is a DIN rail mount,
potentiometer input signal conditioner with
1800VDC isolation between DC power
and the input/output circuitry. The input
provides a constant voltage and is de­signed to accept any three-wire potenti­ometer from 100Ω to 100KΩ. The field
configurable output is switch selectable
providing either 0-5V, 0-10V, 0-1mA, 0­20mA or 4-20mA DC signal.

Wide ranging, precision zero and span
pots, used in conjunction with DIP switches,
allow 80% adjustablity of offset and gain to
transmit a full scale output from any 20%
portion of the potentiometer input.

APPLICATION

The DRG-SC-PT field configurable, po­tentiometer input signal conditioner is use­ful in transmitting process control setpoints
to remote PID controllers or interfacing
position sensors to data acquisition and
control systems.

The DRG-SC-PT's high density DIN rail
mounting offers an extremely compact
solution for saving valuable panel space.

CONFIGURATION

A major advantage of the DRG-SC-PT is
its wide ranging capabilities and ease of
configuration.

For example, in a valve positioning appli­cation a potentiometer is sometimes used
as a feedback signal. Quite often a wide
open valve is only a 25% turn of the feed­back potentiometer. In this case the DRG­SC-PT can easily be adjusted with the
zero and span to provide a full scale output
signal (e.g. 4-20mA) representing 0-25%
or even 50-75% of the potentiometer input.

Unless otherwise specified, the factory
presets the Model DRG-SC-PT as fol­lows:

Input Range: 0 to 100%
Output: 4 to 20mA

The DC power input accepts any DC
source between 9 and 30V; typically a 12V
or 24VDC source is used.

For other output ranges, refer to Tables
1 and 2 to reconfigure switches SW1
and SW2 for the desired input and output
ranges.

WARNING: Do not attempt to change
any switch settings with power applied.
Severe damage will result!

CALIBRATION

1. With power disconnected, set the
output and input switch selectors (SW1
and SW2) to the desired ranges (Tables
1 and 2).

2. Connect the input and output as shown
in Figure 1. Connect the output to the
actual device load (or a load approxi­mately equivalent to the actual device
load value) and apply power.

NOTE: To maximize thermal stability,
final calibration should be performed in
the operating installation, allowing ap­proximately 1 to 2 hours for warm up and
thermal equilibrium of the system.

3. Set the input potentiometer to the
desired minimum and adjust the zero
potentiometer for the desired minimum
output.

4. Set the input potentiometer to the
desired maximum and adjust the span
potentiometer for the desired maximum
output.

Figure 1: Wiring Diagram for DRG-SC-PT

Table 1: Input Range
Switch Selector (SW2)

Table 2: Output Range Switch
Selector (SW1)

DIMENSIONS

SPECIFICATIONS

Potentiometer Input

Resistance (End to End):

100W up to 100KΩ
Input Impedance: >1MΩ
Input Excitation: 500mV, 5mA

maximum drive.
Zero Turn-Up: 80% of full scale input
Span Turn-Down: 80% of full scale
input (Table 1)
Common Mode Rejection:

1800VDC (input to ground)

Output

Voltage Output

Output: 0-5V, 0-10V

Source Impedance: <10Ω

Drive: 10mA, max.

(1KΩ min. @ 10V)

Current Output

Output: 0-1mA, 0-20mA,

4-20mA

Source Impedance: >100KΩ

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LED Indication (green)

Active DC power

Humidity (Non-Condensing)

Operating: 15 to 95% (@ 45°C)
Soak: 90% for 24 hours (@ 65°C)

Temperature Range

Operating: 0 to 55°C (32 to 131°F)
Storage: -25 to 70°C (-13 to 158°F)

Mounting

Horizontal DIN rail mounting is
recommended. Vertical DIN rail
mounting requires heat sink
(model HS01, included) and
circulating air is recommended.

Power

Compliance:

0-1mA; 7.5V, max. (7.5KΩ, max.)
0-20mA; 12V, max. (600Ω, max.)

4-20mA; 12V, max. (600Ω, max.)
Accuracy (Including Linearity,
Hysteresis)

±0.1% maximum at 25°C.

Stability

Temperature: <±0.05%/°C

maximum of full scale range.

Line Voltage: <±0.01%/%

Consumption: 1.5W typical, 2.5W max
Range: 9 to 30VDC

Agency Approvals

CSA certified per standard C22.2,

No. 0-M91 and 142-M1987 (File No.
LR42272). UL recognized per
standard UL508 (File No.E99775). CE
Conformance per EMC directive 89/
336/EEC and Low Voltage 73/23/EEC.

Mounting

32mm and 35mm DIN Rail

maximum of full scale range.

Response Time (10 to 90%)

<200mSec., typical.

Common Mode Rejection

DC to 60Hz: 120dB

Isolation

1800VDC between line power and

input, output

EMC Compliance (CE Mark)

Emmissions: EN50081-1

PIN CONNECTIONS

11 Pot. Input (full clockwise)
12 Pot. Input (full counterclockwise)
21 DC Power (+)
22 DC Power (-)
41 Pot. Input (wiper)
42 Shield Ground
51 Output (+)

52 Output (-)
Immunity: EN50082-2
Safety: EN50178

OMEGA ENGINEERING, INC. warrants this unit to be free of manufacturing defects for the life of the product.
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA's Customer Service Department will issue an Authorized Return
(AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at
no charge. OMEGA's WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper
interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having
been tampered with or shows evidence of being damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specifica­tion; misapplication; misuse or other operating conditions outside of OMEGA's control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.

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FOR WARRANTY RETURNS, please have the following information
available BEFORE contacting OMEGA:

1. P.O. number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the product

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engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
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The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter
specifications without notice.
WARNING: These product are not designed for use in, and should not be used for, patient connected applications.

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RETURN REQUEST/ INQUIRIES

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
charges. Have the following information available BEFORE contacting OMEGA:

1. P.O. number to cover the COST of the repair,

2. Model and serial number of product, and

3. Repair instructions and/or specific problems relative to the product.

721-0615-00B 11/97